80899840 has 72 divisors (see below), whose sum is σ = 221487840. Its totient is φ = 27734016.

The previous prime is 80899837. The next prime is 80899859. The reversal of 80899840 is 4899808.

It is a super-2 number, since 2×80899840² = 13089568224051200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4446 + ... + 13474.

It is an arithmetic number, because the mean of its divisors is an integer number (3076220).

Almost surely, 2^80899840 is an apocalyptic number.

80899840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80899840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110743920).

80899840 is an abundant number, since it is smaller than the sum of its proper divisors (140588000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

80899840 is an equidigital number, since it uses as much as digits as its factorization.

80899840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9057 (or 9043 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 80899840 is about 8994.4338343222. The cubic root of 80899840 is about 432.4964571418.

The spelling of 80899840 in words is "eighty million, eight hundred ninety-nine thousand, eight hundred forty".